Making a pledge means donating some value (e.g. $10) at some interval (e.g. once a month) for some period of time (e.g. a year).

The charges will be made automatically to your credit or bank card (Visa, Mastercard, or Discover) or withdrawn from your Paypal account. The minimum donation per installment is $5.

Periodic pledges qualify as the Erowid membership level appropriate to the value donated in a year. Membership gifts can be requested after your contributions reach the required total for the gift you'd like to receive (i.e. if you pledge $10/mo, and would like a t-shirt, you can request the shirt after the fifth month, when your donated total exceeds $45, the minimum for a shirt).